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Storing only time, not date

Please tell me how we can define the data type for the date field to store only time, not date, like hh24:mm.

I would say that I would still use the DATE datatype. But I would just set the day to be the same day. For instance, if I had to store "12:12", "13:13", and "09:59" into a table, I would probably use INSERT statements similar to the following:

INSERT INTO my_table VALUES TO_DATE('01/01/01 
'||'12:12','MM/DD/YY HH24:MI'); 
INSERT INTO my_table VALUES TO_DATE('01/01/01 
'||'13:13','MM/DD/YY HH24:MI'); 
INSERT INTO my_table VALUES TO_DATE('01/01/01 
'||'09:59','MM/DD/YY HH24:MI'); 
Why would I do this? Because with this method, date arithmetic operations still work. You can compute the difference between two different values with just a subtraction operator, for instance. If date arithmetic is not important to you, then you may consider just storing these values in a character field.

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